File : fz_io.ads
1 ------------------------------------------------------------------------------
2 ------------------------------------------------------------------------------
3 -- This file is part of 'Finite Field Arithmetic', aka 'FFA'. --
4 -- --
5 -- (C) 2018 Stanislav Datskovskiy ( www.loper-os.org ) --
6 -- http://wot.deedbot.org/17215D118B7239507FAFED98B98228A001ABFFC7.html --
7 -- --
8 -- You do not have, nor can you ever acquire the right to use, copy or --
9 -- distribute this software ; Should you use this software for any purpose, --
10 -- or copy and distribute it to anyone or in any manner, you are breaking --
11 -- the laws of whatever soi-disant jurisdiction, and you promise to --
12 -- continue doing so for the indefinite future. In any case, please --
13 -- always : read and understand any software ; verify any PGP signatures --
14 -- that you use - for any purpose. --
15 -- --
16 -- See also http://trilema.com/2015/a-new-software-licensing-paradigm . --
17 ------------------------------------------------------------------------------
18 ------------------------------------------------------------------------------
19
20 with Words; use Words;
21 with FZ_Type; use FZ_Type;
22 with FZ_Lim; use FZ_Lim;
23
24
25 package FZ_IO is
26
27 pragma Pure;
28
29 -- Expand FZ N by nibble D, and determine whether this operation overflowed
30 procedure FZ_Insert_Bottom_Nibble(N : in out FZ;
31 D : in Nibble;
32 Overflow : out WBool);
33
34 -- A count of ASCII chars representing a humanized FZ:
35 subtype Char_Count is
36 Positive range Nibbleness * FZ_Minimal_Wordness .. Positive'Last;
37
38 -- Determine the number of ASCII characters required to represent N
39 function FZ_ASCII_Length(N : in FZ) return Char_Count;
40 pragma Inline_Always(FZ_ASCII_Length);
41
42 -- Hex Digits (currently used only in FZ_To_Hex_String)
43 HexDigs : constant array(0 .. 15) of Character := "0123456789ABCDEF";
44
45 -- Write an ASCII hex representation of N into existing string buffer S
46 procedure FZ_To_Hex_String(N : in FZ; S : out String)
47 with Pre => S'Length = FZ_ASCII_Length(N);
48
49 end FZ_IO;